Heat transfer facilities in ice-cream freezers



May 1, 1934. J. -l. CORN El AL HEAT TRANSFER FACILITIES IN ICE CREAMFREEZERS 3 Sheets-Sheet 1 Original Filed Feb. 29, 1932 Uo/"n/ y 1934 J.I. CORN ET AL HEAT TRANSFER FACILITIES IN ICE CREAM FREEZERS- OriginalFiled Feb. 29. 1932 3 Sheets-Sheet -2 69 Z nvezaio/ts Corvz/ May 1,1934. Jqmom ETAL- 1.956. 13

HIM} TRANSFER FACILITIES IN ICE CREAM FREEZERS ori inal Filed Feb. 29,1932 I 3 Sheets-Sheet 3 Patented May 1, 1934 PATENT OFFICE HEAT TRANSFERFACILITIES IN ICE-CREAM FREEZER Julius 1. Corn and Ralph E. Hyatt,Chicago, Ill.,

assignors to Ice-Cream Freezer Corporation, Chicago, 111., a corporationof Illinois Original application February 29,

Divided and this application July 30,

595,700. i932, Serial No. 627,160

1932, Serial No.

1 Claim. (c1. 257-10 This application is a division of our applicationfor United States Letters Patent freezers, Serial No.

for Ice-cream 595,700.

in ice-cream freezers, and has for its principal object the provision ofan ice-cream freezer of such neat appearance and compact form as to besuitable for mounting on a store counter, such, for instance, as thecounter generally provided in front of a soda water fountain.

As will hereafter be seen,

freezing compartment is statype wherein the our freezer is of thetionary and scrapers and heaters are mounted to rotate within theIce-cream freezers are freezing compartment.

devices in which occur changes of te perature through relatively wideranges becaus domestic, making of hot fluids, especially in thecommercial, and also in the ice-cream relatively warm or in thecleansing of the apparatus, are frequently introduced into the freezing'chamber. The

\ placing of material in the freezer subjects hot or'even warm thefreezer to the wide range of change of temperature above noted,

and, for this reason, in the development expansion of the g ployed forabsorbing that the introduction of warm little progress has been made ofapparatus in which direct ases in the freezer are emthe heat, it beingunderstood or hot materials into a freezer employing a direct expansioncooling system will inevitably produce relatively high pressures in theexp It has ice-cream freezer in anding gas.

been one of our objects, to produce an which the owner may employ forcooling purposes either the circulation of a cool brine or directexpansion of gases as he may desire, or may be equipped to use, and thatin the event that he desires to use the direct expansion method ofcooling, he

secure cons'derably increased eflity and thereby can do so with perfectsafeciency and quicker freezing of the product.

For accomplishing the above object we have increased the effectivenessof our apparatus by encircling the tank forming the freezing compartmentwith a constrictive coil of tubing and tinned the tubing directly to theexterior of thetank,

whereby the conduction of heat from the freez-- ing compartment isfacilitated.

to the refrigerant in the coil As will hereafter be seen the coil oftubing hasver the tically which insures a quick refrigerant throughoutthe coil as well as a" complete drainage from the coil of such oil orlubricant asmay be employed with the refrigerant. The use of such a coilnot only permits the satisfactory use of a cool brine as a terials areintroduced into freezing compartment easily be made sufliciently strongto insure against expansion is employed and warm or heated-mathefreezer. In our freezer we have also designed the base and freezingcompartment, which ismounted on the base, so that the freezingcompartment may be positioned with respect to the base to bring thedischarge port upon any desired side of the installation.

We have attained the foregoing objects by means of the structureillustrated in the accompanying drawings, in which- Fig. 1 is a verticalelevation of an ice-cream freezer embocitying our invention. 7 Fig. 2 isa op plan of the structure shown in Fig. 1.

Fig. 3 is a se tion on line 3-3 of Fig. 1.

Fig. 4 is an elevation, the exterior walls bein partially broken awayand the, interior beaterdrive mechanism sectioned on line 4-4 of Fig. 3.

Fig. 5 is a section on,line 5-5 of Fig. 3.

Similar reference characters refer to similar parts throughout therespective views.

The base is generally cylindrical in form and consists of a lowermost,intermediate and upper section, 10a, 10b and 100. Journaled transverselyand eccentrically of the intermediate section 10b of the base is a shaft11, one end whereof extends out of the base for coupling with the shaftof a motor not Upon the portion shown; of the shaft 11 within the baseis provided a worm 12 which meshes with a worm wheel 13 fixed to a shaft14 journaled vertically in and centrally of the base. The top of theshaft 14 is associated with a Cool: seal 15, an apparatus to be obtainedupon the market and which is no portion of our present invention. The,Cook seal terminates upwardly in a shaft 16 provided with a vertical,centralslotl']. a The top member of the base is provided with a.laterally extending flange 18 through which extends stud bolts 19 forsecuring the upon the base. The 10- cations of the stud bolts 19 and theapertures 100 in the flanges 18for their reception are equally spacedabout'the circumference of the flange 18 so that the freezingcompartment may be assembled with the base in different positions. Thefreezing compartment consists of a suitable bottom casting'20 of diskform and a top casting 21 of the form of an annulus, between which topof metal walls of the tom casting 20 is a central depending tubulardevelopment 23 for the accommodation of the Cook seal, and adjacent theedge of the bottom casting 20 is a tubular development 24 providing adischarge passageway from the freezing compartment? The outer end of thedevelopment 24 is closed by a gate valve 25.

Seated upon the casting 20 is a spun metallic container 26 the bottomand side walls of which are integral. The bottom of the container 26 isperforated centrally to permit the passage of the split-shaft l6 andeccentrieally so as to register with the bore of the dischargedevelopment 24'. The upper edge of the container 26 fits within anannular channel in the top casting 21. Wrapped about the container 26 isa coil of tubing 27, which is preferably slightly flattened, and afterthe coil has been put in place the coil 27 and container 26 are dippedin a bath of melted tin, which secures the coil to the container andprovides a continuous metallic path 27a therebetween. The coil 27,before its assembly with the container 26, is preferably wound about amandrel of slightly smaller diameter than the container, whereby, whenit is assembled .with the container, it willexert a slightlyconstrictive pressure upon the container thereby insuring a moreintimate relation between the coil and the container and eliminating anyrelative movements between the coil and container when pressures aredeveloped within the coil.

The lower end of the coil formed of the tubing 27 is sweated into aninteriorly threaded port 23 provided in the casting 20, and the upperend of the coil 27 is continued in a downwardly extending piece oftubing 29 which is suitably secured in another interiorly threaded port30 provided in the casting 20. The space between the ex terior of thecoil 27 and the interior face of the cylinder 22 is filled with suitableheat insulating packing 31.

Proportioned to enter the container 26 is the rectangular frameconsisting of the bottom member 32, the top member 33 and the verticalside members 34 and 35. Centrally of the bottom member 32 of the framedepends a tubular embossment 36 into which enters the top of thesplit-shaft 16 and running-diametrically through the tubular embossment36 is a fixed pin 37 which enters the slot 17 in the top of the shaft 16so that the rotation of the shaft 16 secures the rotation of the frame.The bottom member 32 of the frame is provided with upwardly curvedblades or developments 38 which function to carry the semi-frozencontents of the container 26 to. the discharge port.

Depending from the lower face of the member 32 are bored semi-circulardevelopments 39 which pivotally carry a bottom scraper blade 40.

Vertical scraper blades 41 having bifurcated ends are pivoted by heatedbolts 42 between the v upper and lower frame members 32 and 33.

From the central portions of the lower and upper frame members 32 and 33are developments or extensions '43. In the extensions 43 from the lowerframe member are Journaled the lower reduced ends of beater shafts 44.Allgningwith the Journals in the extensions 43 of the lower frame memberin the extensions 43 of the upper frame member are mounted removablebushings 45 for accommodating the upper reduced ends of the beatershafts 44. The employment of the removable bushings is for the purposeof permitting us to adjust the relation of the beater blades 46 carriedby the respective beater shafts .44 with relation to each other, as wehave found that by causing the beater blades 46' on the respectiveshafts to cross the line joining the two shafts at different times theviolence of the action of the heaters may be greatly reduced.

Upon the reduced upper ends of the beater shafts 44 are fixedly securedgears 47. Journalcd in the central portion of the upper frame member 33between the bushings 45 is a stub shaft 48, to the lower end of which isfixedly secured a gear 49 meshing with the gears 47. The upper end ofthe stub shaft 48, which extends above the upper frame member 43 extendsinto an aperture in the cover and is centrally slotted or apertured at50 to assemble with a driven clutch member hereafter to be described.

Fitting within the central opening of the an' nular upper casting 21 isa top or closure 51. To hold the closure 51in place arms 52are pivotallysecured to the annulus 21 by stub bolts 53. The free ends of the arms 52are bored and tapped for the reception of milled headed screws 54 which1 are screwed down upon the closure 51 to hold it in place. The centerof the closure 51 is perforated and from the under surface of theclosure about the perforation is an embossment providing the shoulder55, which shoulder is adapted to 1 receive and provide a bearing for theshaft 48. Mounted above the shaft 48 in the central aperture in thecover is the conical headed driven clutch member 57, the lower endwhereof is reduced and enters the recess or slot 50 in the stub 1 shaft48. Aboutthe central perforation in the closure 51 is an upwardlyextending tubular em- I bossment 58 which is interiorly tapped toreceive the knurled and headed bolt 59, the reduced lower end whereof isprovided with a conical recess 60 1 to co-opcratc with the driven clutchmember 57.

It will .now be seen that by retracting the knurled and headed bolt 59the driven clutch member 57 will be released to rotate freely, whichwill permit the gear 49 to rotate with the scraper and heater frame andno axial rotarymotion will; be imparted to the beater shafts 44. Such anonrotating adjustment is. desirable while the material in the freezeris being chilled and before it commences to freeze. When freezing hascommenced the bolt 59 is screwed in which delays the rotation of thedriven clutch member 57 and starts the axial rotation of the beatershafts, the rate of rotation of which may be controlled by the extent towhich the bolt 59 is screwed in and the rotation of 'the shaft 48delayed. By such a control'of the rotation of the beater blades we canadapt our mechanism to a wide range of materlals and also produce aproduct of the desired consistency.

Having described our invention what we claim as new and desire to secureby Letters Patent is:

An ice-cream freezer comprising a base and a freezing compartmentmounted upon and supported by said base with its axis disposedvertiinterior metal container about which is coiled tubing, said tubingand container having the interstices therebetween filled with tin.

JULIUS I. CORN. RALPH E. HYATT.

cally, said freezing compartment including an

